Process of making fertilizer from tank-water



I UNITE PATENT FFI E OMAR T. JOSLIN, or CHICAGO, ILLINOIS.

PROCESS OF MAKlNG FERTILIZER FROM TANK WiATER.

r jet in known that I, OMAR 'r. JOSLIN, aciti- SPECIFICATION formingpart of Letters Patent No. 489,010,, dated January 3, 1893;

.To all whom it may concern:

zen of the United States, residing at Chicago, inthe county of Cook and State of Illinois, have invented a certain new and Improved Process of Treating Tank-VVaters, of which thefollowingis a full, clear, and exact description.

, My invention relates to processes of treating the refuse waters of slaughter-houses,

"commonly called tank waters, to render them i fit for use as fertilizers.

tank waters are very rich in nitrogenous comf fertilizers;

As is well known,

pounds, and it is very desirable that these compounds should be recovered for use as The greatimpediment'to their recovery in a state fit for such use has been that they are very hygroscopic, and unless this property can he eliminate-i1 they are not marketable, as they will readily absorb moista nre from the air and soon become so moist 1 that they cannot be transported or stored,

u and are therefore of little value. processes have been invented foi recovering Various these nitrogenous compounds and rendering them non-deliquescent; but such processes ;have generally involved the loss of a large proportion of the ammoniates, which constitute the principal valuable constituent of the tank waters, and consequently the value of Y the product is greatlylessened.

The objects of my invention are to provide i a newand improved process for treatingtank it waters, in which only a small percentage of the ammoniates will be lost, and which will be simple and inexpensive, I accomplish these objects by treating the waters in the following manner.

. been produced in the usual manner, itis evap- After the tankwater has orated to a sirupy condition, containing from about thirty to forty per cent. of water. Into this sirup is added from five to ten per cent.

. 5 of its weight of sulphuric acid or muriatic acid. Before adding the acid the sirup is preferably heated to a temperature of from 140 to 200 Fahrenheit. By adding the acid l as above described, a precipitate is formed,"

and the constitution of the original sirup is altered. The complex nature of the tank watersrenders it somewhat difficult to determine the exact nature of the precipitate,but

it consistsof certain albuminous constituents Application filed September 28, 1891. Serial Nit 107,003. (Specimens) of the tad k, water which are insoluble in the supernatant sirup. Instead of using sulphuric or muriatic acid to cause the above mentioned precipitate, acid phosphates or from twenty to forty per cent. of dried or dampened ground tankage, hoofs, horns, or pressed cooked blood is now added, which absorbs the saline liquid and renders the mass s'ufficiently solid to permit of itsbeinghandled. In order to cause the greatest possible precipitation in each of the-above processes, the Pmaterials are thoroughly mixed, so that the "dilierent constituents will be thoroughly incorporated with each other. The produ ct resulting after the dried tankage, hoofs, horns, orcooked blood has been added,is then placed in shallow pans and dried in suitable ovens, at a temperature of from 300 to 400 Fahrenheit, which drying renders the materials almost perfectly-anhydrous and hastens the evaporation.

In order to prepare the product for transportation, storage, or other purposes to which it is intended to apply it, it is taken from the ovens, and after cooling, is ground to a powder. vIt will generally be found that one or more of the above mentioned operations will be sutficient to produce a material whose hygroscopic power is sufficiently small to allow of its commercial use as ahigh-grade ammoniate. Certain tank waters have however been found to be much more hygroscopic than others, and to treat them most successfully it has been found that a further operation is necessary, which operation is as follows: After the ground and dried product has been formed, as above specified, it is placed in a to render the entire mass more or less solid,

acid sulphates may be used, as their action is i suitable receptacle and there is subjected to a temperatureof from 300 to 400 Fahrenbolt, the product being constantly stirred or kept in motion while it is exposed to the heat. The-material is exposed to the above mentioned degree of heat for from fifteen min- Utes to one hour, when it will be found that each particle of the product is far more insoluble and hence more nondeliquescent than before. In heating, the product, as above described, I prefer to use steam heat,

but other methods of heating may be used ifdesired. During the process of heating, large quantities of the ammonia contained in the product would be driven off were it not for the presence of the magnesium, manganese or z1nc salts, which are good absorbents of ammonia, and therefore prevent its escape during the process of heating. After the product has been removed from the receptacle 7 in which it has been heated, it is ready to be packed in sacks or barrels, and may then be readily stored or transported, as the property of absorbing moisture will have been almost entirely eliminated.

There is an important advantage attained by adding the acid to the tank water after concentration, in that it is impracticable to concentrate the water after precipitation, as the precipitate would settle on the tubes and on the bottom of the'evaporating' vessel,where economically.

it would cake and ultimately burn, and require to be scraped 0d and thrown away.

This would involve a loss, and by reason of the coating of the pipes of the heating apparatus it would be impossible to evaporate As the original water contains "as high as seven per cent. (maximum), and

'ganese and zinc,-the amount of non-nitrogen nous matter introduced is much less, and the percentage of nitrogenous matter correspond in gly increased. The magnesium has a beneficial effect as it is not inert, but acts to a certain extent as a fertilizer.

That which I claim as new and desire to secure by Letters Patent, is,-

1. The process of treating tank Waters to recover certain albuminous constituents, which consists in first evaporating the tank waters to a sirupy condition, then heating the sirup to a temperature of from 14.0 to 200 Fahrenhe it, then adding a small percentage of sulphuric acid,'and then drying the product, substantially as described.

2. The process of treating, tank waters, which consists in firstcvaporating the water 'to, a

sirupy condition, then adding a small percentage of sulphuric acid, then adding from live to twenty per cent. of sulphate of magnesium, and then drying the product, substantially as described.

3. The process oftrea'tingitank waters,which consists in evaporating the, waters to a sirupy cond tion, adding a small percentage of sulphuric acid, then addingyfrom five to twenty per cent. of sulphate otmagnesiuin, then adding-an'absorhent of the supernatant liquid, and then drying theproduct, substantially as described. T f f 4. The prbcessof treatingtank Wate1's,\vl1icli consists in evaporating the water to a si'rupy' condition, then adding sulphu'ricac'id, then adding sulphate of magnesium, then adding an absorbent ofthe supernatanthliquid,and then dryingrthe product at a temperature of from SQLPftOeLOO" Fahrenheit, substantially as desciibed.

5, jlhe process of treating tank waters,which consists in eyaporatingrthe, water to asirupy 7 none tion, then addinttto the solution a small percentage of sulphuric acid, rying and grinding the product, and then su leeting it, wh'enin motion, to the action of a hea, of from s00" to 100 Fahrenheit, fOP'fIOm fifteen minutes to an hour, substantially as described.

The process of treatingtank waters which consists in precipitating the albuminous con Sllld LGnl'S Of the water by suitable reagents,- that], drying and grinding'the product, and then subjecting it, while in motion, to a temperature of from 3 00 to 400 Fahrenheit, for

from fifteen minutes toan hour, substantially as described. I

. OMAR T. JOSLIN.

\Vitnesses:

JOHN L. JACKSON, A. ll. ADAMS. 

